/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ignite.internal.processors.cache.binary;

import java.io.Serializable;
import org.apache.ignite.internal.binary.BinaryMetadata;

/**
 * Wrapper for {@link BinaryMetadata} which is stored in metadata local cache on each node.
 * Used internally to track version counters (see javadoc for {@link MetadataUpdateProposedMessage} for more details).
 */
final class BinaryMetadataHolder implements Serializable {
    /** */
    private static final long serialVersionUID = 0L;

    /** */
    private final BinaryMetadata metadata;

    /** */
    private final int pendingVer;

    /** */
    private final int acceptedVer;

    /** */
    private final transient boolean removing;

    /**
     * @param metadata Metadata.
     * @param pendingVer Version of this metadata - how many updates were issued for this type.
     * @param acceptedVer Pending updates count.
     */
    BinaryMetadataHolder(BinaryMetadata metadata, int pendingVer, int acceptedVer) {
        this(metadata, pendingVer, acceptedVer, false);
    }

    /**
     * @param metadata Metadata.
     * @param pendingVer Pending updates count.
     * @param acceptedVer Version of this metadata - how many updates were issued for this type.
     * @param removing Flag means the metadata is removing now.
     */
    private BinaryMetadataHolder(BinaryMetadata metadata, int pendingVer, int acceptedVer, boolean removing) {
        assert metadata != null;

        this.metadata = metadata;
        this.pendingVer = pendingVer;
        this.acceptedVer = acceptedVer;
        this.removing = removing;
    }

    /**
     * @return Holder metadata with remove state where remove pending message has been handled.
     */
    BinaryMetadataHolder createRemoving() {
        return new BinaryMetadataHolder(metadata, pendingVer, acceptedVer, true);
    }

    /**
     *
     */
    BinaryMetadata metadata() {
        return metadata;
    }

    /**
     *
     */
    int pendingVersion() {
        return pendingVer;
    }

    /**
     *
     */
    int acceptedVersion() {
        return acceptedVer;
    }

    /**
     * @return {@code true} is the metadata is removing now.
     */
    boolean removing() {
        return removing;
    }

    /** {@inheritDoc} */
    @Override public String toString() {
        return "[typeId=" + metadata.typeId() +
            ", pendingVer=" + pendingVer +
            ", acceptedVer=" + acceptedVer +
            ", removing=" + removing +
            "]";
    }
}